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(No Model.) 2 Sheets-Sheet 1.

A. M. BARBER & G. GABRIEL.

MEANS FOR PREVENTING THE RUNNING OFF OF BELTS.

No. 395,201. Patented Dec. 25, 1888.

.dttorney N. PETERS. Photn-Limegnphcr. Wflshingtnm D. C.

(No Model.) v 2 Sheets-Sheet 2.

A. M. BARBER & O. GABRIEL.

MEANS FOR PREVENTING THE RUNNING OFF OF BELTS.

No. 395,201. Patented Dec. 25, 1888.

WITNESSES a 17\/% N. PETERS, PhoIbLilhognpMr, wnmngnm n c.

Unirnn STATES PATENT Grrrcn.

AUGUSTUS M. BARBER AND CHARLES GABRIEL, OF EAST SAGINATV, MICH- IGAN, ASSIGNORS OE ONE-THIRD TO HAROLD L. BRINTNALL, 'OF SAME PLACE.

MEANS FOR PREVENTING THE RUNNING OFF OF BELTS SPECIFICATION forming part of Letters Patent No. 395,201, dated December 25, 1888. Application filed April 30, 1883. Serial No. 272,390. (No model.)

To It whom it may concern:

Be it known that we, AUGUSTUS M. BAR- BER and CHARLES GABRIEL, citizens of the United States, residing at East Saginaw,

5 county of Saginaw, State of Michigan, have invented a certain new and useful Improvement in Means for Preventing the Running v()tf of Belts; and we do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this s iiecification.

In the drawings, Figure l is a plan view of apparatus, illustrating our invention. Fig. 2 a side elevation of the same. Figs. 3, 4:, and 5 are detail views. Figs. 6, 7, and 8 are enlarged detail views.

It is the purpose of our invention to produce a mechanism which shall constitute a protection against the slipping off of belts, whereby not only the machinery which is being driven but the driving-belt may likewise be protected from injury.

The apparatus is specially well adapted for the protection of dynainos and other electrical machinery from injury by reason from any circumstances which should alter the load upon its belt to such an extent as to cause the latter to slip off from its pulley. It is, however, well adapted for any kind of machinery, and we would have it understood that it is not confined to electricalmachinery.

Our invention consists, essentially, in a mechanism adapted to span the belt adjacent to the driving or driven pulley, said mechanism so constructed that should the belt slip in either direction, its edge coming against a small pulley may wind thereon a strap or band, which in the case of electric machinery may serve to open the circuit and so relieve the belt of the load which is causing it to shift from the pulley, and in case of other machinery the winding of the said strap or band may operate to release the frictionclutch through which the belt is driven, and so instantly relieve it of its load.

In carrying out our invention, A may rep resent a drive-shaft; B, a loose pulley; O, a friction-clutch, whereby said pulley is thrown into engagement with its shaft; C, a lever for throwing the clutch into engagement with the pulley.

D is the belt, and E the driven pulley, which 5 5 for the present we will presume to be the pulley of adynamo-electric machine. (Shown in diminutive form at the left of Fig. 6.)

E is a switch-lever located on the circuit of the dynamo, and which serves to complete the circuit by connecting the binding-posts e e, and a spring at any point-as, for instance, at its hub c may instantly serve to open the lever when the latter is released.

F and F represent two upright rollers ad jaeent to the belt. Upon each roller is partially wound a strap, f, one end of which is fastened to the roller. The other projects out between the two rollers and is engaged to a central plate or slide, G. Another strap, f 7o likewise fastened to the roller, projects back along the belt. These two straps f are here united to a common cord or strap, This leads to a plllllg'6l,f held by a spring, f into engagement with the end of a second plunger, ll. lhis last plunger is governed by a spring, II, and the outer end of the plunger is en gaged with the sh it'ting-lever C of the frictionclutch.

G is an upright latch which rests within the slot g in the slide G. It also reaches down into a notch, 6 at the end of the switchlever, and serves to hold the switch-lever in proper position to complete the electrical circuit.

The operation of this device will nowbe understood. Suppose the belt to be moved in the direction indicated by the arrow. Now should the belt for any reason-as, for i11- stance, by the short-circuiting of. the dyna- 9o m0becon1e so overloaded as to slip from the pulley E, it would at once come into contact with the adjacent upright roller F or F. This would instantly set the roller into motion and wind upon it the bands f f. This would draw the slide or plate G toward that roller, and the latch G would, by the slot 9, be thrown out of engagement with the notch c at the end of the switch-lever E. The spring e would instantly throw the lever into a position to open the circuit of the dynamo, and so relieve the belt of its load. At the same time the band f would draw upon the band or cord f which would release the plunger f 3 from the plunger H. The spring II would instantly force the lever C outward and so release the friction-clutch C from the pulley B. It is thus apparent that just as soon as the belt begins to shift from its pulley it operates automatically to relieve itself of the overload which gave it a tendency to leave its pulley.

The rollers F F may be engaged with a support, F and this maybe provided with a dovetailed slot, F adapted, as shown in Fig. 5, to receive the upright shaft F, and a nut or clamp-screw, F", may bind the shaft in any desired position. It is thus made adjustable to suit any width of belt.

The plate G may also have a tongue, 9, adapted to enter the slot F and may be held in place so as to slide freely therein by a guardplate, 9 It is apparent that where this de- Vice is employed for mechanism other than a dynamo, or where it is not employed to open an electric circuit, the straps fand the sliding plate G and the lever E may all be dispensed with, and there may be employed only the bands and with their connecting mechanism, the apparatus in such case being adapted solely to throw the friction-clutch out of gear with its pulley. So, also, where the device is designed for employment in the p rotection of a dynamo, the bands f f and their connecting mechanism maybe dispensed with and the apparatus be provided only with the bands f, the sliding plate G, and switchlever E, since this mechanism alone will serve to open the circuit and so relieve the dynamo of its load, and it is not absolutely essential that it should be relieved of its current, and also that the friction-clutch should be thrown out of en a ement with its mlle of belts, the same consisting of the combination, with a belt, of a roller adjacent to its edge and adapted to be revolved thereby as the belt starts to leave its pulley, and in connection therewith a band engaged with said roller and with the friction-cl utch mechanism, the construction being such that as the band is wound upon the roller it will disengage the friction-clutch from its pulley, substantially as and for the purposes described.

2. The combination, with the driving-belt of a dynamo-electric machine, of a roller adjacent to the edge of the belt, a friction-clutch whereby the driving-pulley is engaged with its shaft, a band engaging the friction-clutch mechanism with said roller, a switch in the circuit of the dynamo, and a band engaging said switch with the roller, the construction being such that as the roller is turned by the edge of the shifting-belt said bands will be wound thereon and operate to open the circuit and to disengage the friction-clutch from its pulley, substantially as and for the purposes described.

3. The combination, with the drivin g-belt of a dynamo-electric machine, of a roller adjacent to its edge, a switch in the circuit of the dynamo, and a band engaging the switch with the roller, the construction being such that as the escaping belt comes in contact with the roller it will wind the band thereon, thereby releasing the switch and opening the circuit of the dynamo, substantially as and for the purposes described.

4. The combination, with the driving-belt and the friction-clutch mechanism, of the spring-actuated plunger H, the latch f and bands f f and in connection therewith one or more rollers, F F, substantially as and for the purposes described.

In testimony whereof we sign this specification in the presence of two witnesses.

AUGUPTUS M. BARBER. CHARLES GABRIEL. Witnesses:

nrEORGE GRANT, Lou GcHUAs. 

